CN113954801A - Pressure distribution device, pressure control unit and braking system - Google Patents
Pressure distribution device, pressure control unit and braking system Download PDFInfo
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- CN113954801A CN113954801A CN202111350206.3A CN202111350206A CN113954801A CN 113954801 A CN113954801 A CN 113954801A CN 202111350206 A CN202111350206 A CN 202111350206A CN 113954801 A CN113954801 A CN 113954801A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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Abstract
The invention relates to the technical field of braking, and discloses a pressure distribution device, a pressure control unit and a braking system. According to the pressure distribution device, the first redundant part and the second redundant part are matched to form at least two redundant pressure cavities which are not communicated with each other and have variable volumes, when the piston moves relative to the cylinder body, all the redundant pressure cavities realize synchronous pressure change and are not influenced with each other, and even if one redundant pressure cavity fails, other redundant pressure cavities can continue to work. According to the pressure control unit and the brake system provided by the invention, the pressure distribution device is applied, the rotating piece is driven to rotate by the driving piece, the connecting unit is driven to move relative to the cylinder body by utilizing the threaded matching of the rotating piece and the connecting unit, so that the redundant pressure cavities are subjected to pressure building, all the redundant pressure cavities are redundant and do not influence each other, even if one of the redundant pressure cavities fails, other redundant pressure cavities can continue to work, and the brake system can perform timely and effective braking.
Description
Technical Field
The invention relates to the technical field of braking, in particular to a pressure distribution device, a pressure control unit and a braking system.
Background
A pressure control unit in the electromechanical hydraulic servo brake system is mainly used for building pressure by matching a motor with a nut screw structure. In the pressure building process, the screw nut and screw rod structure converts the rotary motion of a motor shaft into linear motion, and the piston is pushed to move in the pressure distribution device through the screw nut and screw rod structure so as to build pressure.
In order to prevent pressure build-up failure, the conventional electric power-assisted brake system usually adopts a main cylinder structure and an auxiliary cylinder structure to realize redundant control, but has the defects of complex structure and high cost.
Disclosure of Invention
The invention aims to provide a pressure distribution device which has the advantages of simple structure and low cost while having a redundant function.
Another object of the present invention is to provide a pressure control unit and a brake system, which can simplify the structure of the pressure control unit, improve the assembly efficiency, and reduce the cost while achieving the redundant control of the pressure build-up of the pressure control unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a pressure distribution device, including a cylinder and a piston, where the piston is movably disposed in the cylinder; the pressure distribution device further includes a redundant structure comprising:
a first redundant portion provided in the cylinder block;
the first redundant part is matched with the second redundant part to form at least two redundant pressure cavities which are not communicated with each other and have variable volumes.
As an optional technical solution of the above pressure distribution device, the cylinder body has a working chamber, the first redundant portion is a redundant convex portion convexly disposed on an inner wall of the working chamber, and the first redundant portion divides the working chamber into at least two redundant pressure chambers which are not communicated with each other;
the second redundant part is a redundant groove arranged on the piston, one end of the piston is provided with sub-pistons in one-to-one correspondence with the redundant pressure cavities by the redundant groove, and the sub-pistons are arranged in the corresponding redundant pressure cavities in a sliding manner.
As an alternative solution of the above pressure distribution device, the working chamber includes two of the redundant pressure chambers, and the two redundant pressure chambers are symmetrically arranged along the central axis of the cylinder block;
the number of the sub-pistons is two, and the two sub-pistons are symmetrically arranged along the central axis of the piston respectively.
As an optional technical solution of the above pressure distribution device, at least one of the redundant pressure chambers is provided with a volume expansion chamber, and the volume expansion chamber is communicated with the redundant pressure chamber corresponding to the sub-piston where the volume expansion chamber is located.
As an optional technical solution of the above pressure distribution device, the expansion cavities correspond to and are communicated with the redundant pressure cavities one to one.
As an optional technical scheme of the pressure distribution device, the expansion cavity is a groove dug in the axial end face of the sub-piston, and an opening of the groove faces an opening of the redundant pressure cavity.
As an alternative solution of the above pressure distribution device, a seal is provided between the outer circumferential surface of the piston and the inner circumferential surface of the cylinder.
As an optional solution of the above pressure distribution device, one end of the piston away from the redundant pressure chamber is connected with a connection unit;
the connecting unit is used for being in threaded connection with the rotating piece, one of the connecting unit and the rotating piece is a nut, and the other one is a lead screw.
As an alternative solution of the above pressure distribution device, the connection unit and the piston are integrally formed, or are in interference fit, or are welded.
As an optional technical solution of the above pressure distribution device, the connection unit is a nut, and the rotating member is a lead screw;
and an avoiding space communicated with the internal thread hole on the screw nut is arranged on the piston and is used for accommodating the screw rod.
As an alternative solution to the above-mentioned pressure distribution device, the pressure distribution device further includes an anti-rotation structure for limiting rotation of the connection unit with respect to the rotation member.
As an alternative solution to the above-mentioned pressure distribution device, the rotation preventing structure includes:
the first rotation prevention part is arranged on the cylinder body;
the second anti-rotation part is arranged on the piston, and the first anti-rotation part is matched with the second anti-rotation part to limit the piston to rotate relative to the cylinder body.
As an alternative configuration of the pressure distribution apparatus, the first rotation prevention unit may be the first redundant unit, and the second rotation prevention unit may be the second redundant unit.
As an alternative solution to the above-mentioned pressure distribution device, the cross-section of the first redundant portion is non-circular and non-circular.
As an optional solution of the above pressure distribution device, the connection unit is provided with a first anti-twisting portion, which is used for cooperating with a fixing member fixed relative to the cylinder body to limit the connection unit from rotating relative to the fixing member.
In a second aspect, the present invention provides a pressure control unit comprising a pressure distribution device as in any one of the implementations of the first aspect.
As an optional technical solution of the pressure control unit, the pressure control unit further includes:
a drive member;
the rotating part is in transmission connection with the driving part, and a connecting unit of the pressure distribution device is in threaded connection with the rotating part.
As an optional technical solution of the above pressure control unit, the connection unit is provided with a first anti-twisting part, and a fixing member fixed relative to the cylinder body is provided with a second anti-twisting part;
the first and second anti-twist portions cooperate to restrict rotation of the connection unit relative to the fixing member.
As an optional technical solution of the above pressure control unit, the connection unit is a nut, the first torsion-preventing portion is a torsion-preventing groove formed in an outer peripheral wall of the connection unit, and the second torsion-preventing portion is a torsion-preventing protrusion formed on the fixing member.
In a third aspect, the invention provides a brake system further comprising a pressure control unit as in any one of the implementations of the second aspect.
The invention has the beneficial effects that: the invention provides a pressure distribution device, wherein a first redundant part is arranged on a cylinder body, a second redundant part is arranged on a piston, at least two redundant pressure chambers which are not communicated with each other and have variable volumes are formed by matching the first redundant part and the second redundant part, when the piston moves relative to the cylinder body, all the redundant pressure chambers can realize synchronous pressure change without mutual influence, and even if one redundant pressure chamber fails, other redundant pressure chambers can continue to work. Has the advantages of simple structure and low cost.
According to the pressure control unit and the brake system provided by the invention, by applying the pressure distribution device, when braking is performed, the rotating piece is driven to rotate by the driving piece, and the rotating piece is in threaded fit with the connecting unit, so that the moving frame drives the piston to move relative to the cylinder body, and the redundant pressure cavities are pressurized, all the redundant pressure cavities are redundant and do not influence each other, and even if one of the redundant pressure cavities fails, other redundant pressure cavities can continue to work, so that the brake system can perform timely and effective braking.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is an exploded view of a pressure brake unit provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a pressure control unit provided by an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a cylinder provided by an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a first end of a piston provided by an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a first end of a piston provided in accordance with other embodiments of the present invention;
fig. 6 is an exploded view of a pressure control unit provided in the second embodiment of the present invention;
fig. 7 is a cross-sectional view of a first end of a piston of the pressure control unit shown in fig. 6.
In the figure:
1. a pressure distribution device; 11. a cylinder body; 111. a first redundancy section; 112. a redundant pressure chamber; 113. a fluid access hole; 114. a second lubricating oil passage; 12. a piston; 121. a second redundancy section; 122. expanding the cavity; 123. avoiding a space; 124. a sub-piston;
21. a lead screw; 22. a nut; 221. a first lubricating oil passage; 222. a first torsion prevention portion;
3. a drive member.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
Example one
As shown in fig. 1 and 2, the present embodiment provides a pressure control unit and a brake system, wherein the brake system includes the pressure control unit, and when a brake pedal is pressed, the pressure control unit builds pressure. The pressure control unit comprises a pressure distribution device 1, the pressure distribution device 1 comprises a cylinder body 11 and a piston 12, the cylinder body 11 is provided with a working cavity with one end open, and one end of the piston 12 is movably arranged in the working cavity.
During braking, the piston 12 moves relative to the cylinder 11, and the pressure distribution device 1 builds up pressure. In case of pressure build-up failure of the pressure distribution device, the brake will be seriously affected. For this reason, the present embodiment provides a pressure distribution device 1, and realizes redundant control when the pressure distribution device 1 builds pressure by adding a redundant structure.
The redundant structure comprises a first redundant part 111 and a second redundant part 121, wherein the first redundant part 111 is connected to the cylinder 11, the second redundant part 121 is connected to the piston 12, the first redundant part 111 and the second redundant part 121 are matched to form at least two redundant pressure cavities 112 which are not communicated with each other and have variable volumes, and each redundant pressure cavity 112 is provided with a fluid inlet and outlet hole 113. Alternatively, the fluid inlet/outlet hole 113 is provided in the cylinder 11.
During braking, the driving piston 12 moves relative to the cylinder 11 to build pressure in the redundant pressure chambers 112, all the redundant pressure chambers 112 are redundant and do not affect each other, even if one of the redundant pressure chambers 112 fails, the other redundant pressure chambers 112 can still work, and the braking system can perform timely and effective braking.
Specifically, the cylinder 11 has a working chamber with an open end, the first redundant portion 111 is a redundant convex portion protruding from the inner wall of the cylinder 11, the redundant convex portion divides the working chamber into at least two redundant pressure chambers 112 that are not communicated with each other, the second redundant portion 121 is a redundant groove formed at one end of the piston 12, the redundant groove enables one end of the piston 12 to form sub-pistons 124 corresponding to the redundant pressure chambers 112 one to one, the sub-pistons 124 are slidably disposed in the corresponding redundant pressure chambers 112, and the volume of the redundant pressure chambers 112 is changed by the movement of the sub-pistons 124.
In other embodiments, the first redundant portion 111 may be a redundant groove formed in the inner bottom wall of the working chamber, the second redundant portion 121 may be a redundant protrusion protruding from the axial end surface of the piston 12, the redundant protrusion penetrates through the working chamber and is inserted into the corresponding redundant groove, the free end of the redundant protrusion is always limited in the redundant groove, the redundant protrusion is in sliding sealing fit with the inner wall of the working chamber, and the working chamber is divided into at least two redundant pressure chambers 112 by the redundant protrusion.
By adopting the redundant structure, not only can all the redundant pressure chambers 112 be redundant during braking, but also the relative movement between the piston 12 and the cylinder body 11 can be guided, and the stability of the piston 12 during movement is improved.
Illustratively, as shown in fig. 3, the redundant protrusion is a partition plate passing through the central axis of the cylinder block 11, and the partition plate divides the working chamber into two redundant pressure chambers 112; the sub-pistons 124 are provided in two, and the two sub-pistons 124 are respectively arranged symmetrically along the central axis of the piston 12. Each slave piston 124 is slidably engaged with a corresponding redundant pressure chamber 112 to vary the volume of the redundant pressure chambers 112 to achieve equal volumes for all of the redundant pressure chambers 112. It should be noted that the dividing plate is not limited to the flat plate structure shown in fig. 3, and in other embodiments, the dividing plate may also be a curved plate with a cross section extending along a curve.
It should be noted that the number of the redundant pressure chambers 112 is not limited to two, but may be three, four or more, that is, the shape of the cross section of the cylinder 11 is not limited to the shape shown in fig. 3, and the redundant projection may be a radial structure having a plurality of partition plates circumferentially spaced apart and centered around an axis, such as a cross shape, according to the number of the redundant pressure chambers 112.
The piston 12 has a first end and a second end which are oppositely arranged, the redundant groove is arranged on the axial end face of the first end of the piston 12, as shown in fig. 4, the redundant groove is arranged to penetrate along the radial direction of the piston 12, the piston 12 is in a cylindrical structure, the redundant groove enables the first end of the piston 12 to form two sub-pistons 124, and each sub-piston 124 is respectively arranged in the corresponding redundant pressure chamber 112 in a sliding manner.
Referring to fig. 2 and 4, it can be seen that the redundant structure not only forms two redundant pressure chambers 112 that are not communicated with each other and guides the relative movement of the piston 12 and the cylinder 11, but also restricts the rotation of the piston 12 relative to the cylinder 11.
Optionally, the pressure control unit provided in this embodiment further includes a driving element 3, a rotating element in driving connection with the driving element 3, and a connecting unit in threaded engagement with the rotating element, the connecting unit being connected to an end of the piston 12 away from the redundant pressure chamber 112. One of the rotating member and the connecting unit is a nut 22, the other is a lead screw 21, and the driving member 3 is a motor or the like.
During braking, the driving part 3 drives the rotating part to rotate, the rotating part drives the connecting unit matched with the rotating part in a threaded manner to move, and the connecting unit drives the piston 12 to move in the cylinder body 11, so that the pressure of the pressure distribution device 1 is built.
Illustratively, the rotating member is a lead screw 21, the connecting unit is a nut 22, the lead screw 21 rotates to drive the nut 22 to move, and the nut 22 drives the piston 12 to move along the axial direction thereof relative to the cylinder 11. In other embodiments, the nut 22 may be used as the rotating member and the lead screw 21 may be used as the connecting unit.
Alternatively, balls are provided between the nut 22 and the screw shaft 21, forming a ball screw structure. In order to improve the smoothness of the relative rotation between the nut 22 and the lead screw 21, a first lubricating oil passage 221 is provided in the nut 22 for introducing lubricating oil between the mating surfaces of the nut 22 and the lead screw 21.
In order to realize that the nut 22 can drive the piston 12 to move when the screw 21 rotates, an anti-rotation structure needs to be arranged on the nut 22, and in the prior art, a single anti-rotation structure is arranged on the nut 22, but the matching between parts and the occupied space of the pressure control unit are increased. In order to solve the problem, in the present embodiment, the piston 12 is fixedly connected to the nut 22 in a manner of limiting the rotation and movement of the piston relative to the nut 22, such as an integral molding, an interference fit, or a welding connection, and then the rotation of the piston 12 relative to the cylinder 11 is limited by the rotation prevention structure, so as to play a role in limiting the rotation of the nut 22 relative to the lead screw 21.
Illustratively, when the connecting unit is the nut 22, the second end of the piston 12 and the nut 22 are integrally formed, so that not only the occupied space can be reduced, but also the structure of the pressure control unit can be more compact; the assembly process of the pressure control unit can be reduced, impact collision between the piston 12 and the nut 22 when the piston and the nut are arranged in a split mode is avoided, and the service lives of the piston 12 and the lead screw 21 are prolonged.
The rotation-proof structure that this embodiment provided includes that first portion and the second of preventing changeing prevent changeing the portion, and wherein, on cylinder body 11 was located to first portion of preventing changeing, the second prevented changeing the portion and locates on piston 12, prevented changeing the portion cooperation through first portion and the second of preventing to restriction piston 12 rotates for cylinder body 11.
In order to simplify the structure of the pressure distribution device 1, the first rotation prevention part is the first redundant part 111, and the second rotation prevention part is the second redundant part 121, so that the piston 12 is circumferentially limited by the redundant structure, and the rotation prevention structure does not need to be arranged independently, and the pressure distribution device is simple in structure and low in cost. Illustratively, referring to fig. 3 and 4, the redundant groove is arranged to penetrate the piston 12 in the radial direction, and the redundant groove and the redundant protrusion cooperate to limit the rotation of the piston 12 relative to the cylinder 11 by using the redundant structure. When the redundant groove and the redundant protrusion are slidably fitted in the moving direction of the piston 12, the piston 12 is prevented from rotating relative to the cylinder 11, and since the piston 12 and the nut 22 are integrally formed, the nut 22 is restricted from rotating relative to the lead screw 21.
It should be noted that, due to the requirement of redundancy control, the number of the redundant pressure chambers 112 is not less than two, so the redundant convex portion cannot be a cylindrical structure, and the corresponding redundant groove cannot be a circular counter bore. When the redundant structure is used to restrict the rotation of the piston 12 relative to the cylinder 11, the redundant groove may be defined in a non-circular and non-circular shape as a projection of the redundant groove on the cross section of the piston 12, and the redundant projection may be not only limited to the flat plate structure shown in fig. 3, but also limited to the curved plate or the like as defined above.
The redundant structure provided by the embodiment can not only enable the piston 12 and the cylinder 11 to form at least two redundant pressure chambers 112 which are not communicated with each other, but also realize the mutual redundant control between different redundant pressure chambers 112; the pressure control device also has a guiding function and an anti-rotation function, and can be used for reducing the number of parts of the pressure reduction control unit, reducing the occupied space, simplifying the assembly of the pressure control unit, improving the assembly efficiency, and reducing the cost and the occupied space without arranging an independent anti-rotation structure for the screw nut 22.
Furthermore, at least one of the sub-pistons 124 is provided with a cavity expansion chamber 122, and the cavity expansion chamber 122 is communicated with the redundant pressure chamber 112 corresponding to the sub-piston 124 where the cavity expansion chamber 122 is located. Optionally, the expansion cavities 122 are in one-to-one correspondence and communication with the redundant pressure cavities 112. The space for pressure build-up is increased by arranging the expansion cavity 122, so that the pressure build-up requirement is met. In other embodiments, as shown in fig. 5, the expansion cavity 122 may not be provided on any of the sub-pistons 124; it is also possible to provide the expansion volume 122 only on a part of the sub-piston 124.
Illustratively, as shown in fig. 2 and 4, the relief volume 122 is a groove dug in an axial end surface of the sub-piston 124, and an opening of the groove is disposed toward an opening of the redundant pressure chamber 112. In order to facilitate the processing of the groove and the redundant groove, a counter bore is arranged on the axial end face of the first end of the piston 12, the part of the redundant groove which is arranged along the radial direction of the piston 12 in a penetrating way is arranged on the bottom wall of the counter bore, one end of the redundant convex part is always limited between the bottom wall of the counter bore and the bottom wall of the redundant groove, so that the counter bores on the two sides of the redundant convex part form an expansion cavity 122 respectively, and the two expansion cavities 122 are not communicated with each other. Alternatively, a counterbore is provided coaxially with the piston 12, the counterbore being circular, such that the volumes of the two expansion chambers 122 are equal. It should be noted that the shape of the counter bore is not limited to a circular hole, and may also be other shapes, such as a rectangular counter bore, a square counter bore, and the like.
Optionally, in order to prevent the piston 12 from interfering with the movement of the screw 21 when the nut 22 and the screw 21 move relatively, an avoidance space 123 is provided at one end of the piston 12 close to the nut 22, an internal threaded hole is provided on the nut 22, the avoidance space 123 is coaxially provided with the internal threaded hole, the minimum diameter of the avoidance space 123 is greater than the outer diameter of the screw 21, and the axial length of the avoidance hole 123 is greater than the maximum stroke of the piston 12. Illustratively, the avoidance space 123 is a circular hole.
Alternatively, in order to prevent the pressure oil in the redundant pressure chamber 112 from leaking through a gap between the outer circumferential surface of the piston 12 and the inner circumferential surface of the cylinder 11 during the sliding of the piston 12 relative to the cylinder 11, a seal member is provided between the mating surfaces of the piston 12 and the cylinder 11. Optionally, two sealing members are disposed between the mating surfaces of the piston 12 and the cylinder 11 and spaced apart from each other in the axial direction of the piston 12 to improve the sealing effect.
In order to reduce the abrasion between the outer peripheral wall of the piston 12 and the inner peripheral wall of the cylinder 11 in the process that the piston 12 slides relative to the cylinder 11, a second lubricating oil channel 114 communicated with the inner cavity of the cylinder 11 is arranged on the cylinder 11 between the two sealing pieces and used for feeding lubricating oil into a gap between the two sealing pieces, and the smoothness of the sliding process of the piston 12 relative to the cylinder 11 is ensured.
Alternatively, when the piston 12 is a structure integrally formed with the nut 22, the axial length of the structure is long, and although the redundant structure can limit the rotation of the piston 12 relative to the cylinder 11, thereby serving to limit the rotation of the nut 22 relative to the lead screw 21, since the nut 22 and the redundant structure are respectively located at the two axial ends of the piston 12, when the lead screw 21 rotates to move the nut 22, the nut 22 is easily twisted by the lead screw 21. In order to solve the technical problem, the pressure control unit further includes a torsion-proof structure, which includes a first torsion-proof portion 222 and a second torsion-proof portion, wherein the first torsion-proof portion 222 is disposed on an outer peripheral wall of the nut 22, the second torsion-proof portion is disposed on a fixing member fixed relative to the cylinder 11, and the first torsion-proof portion 222 and the second torsion-proof portion cooperate to limit rotation of the nut 22 relative to the fixing member.
The redundant structure and the anti-twisting structure are respectively arranged at the two axial ends of the piston 12, so that the nut 22 can be effectively prevented from rotating or twisting when the screw 21 rotates. The first and second torsion prevention portions 222 and 222 cooperate to guide the movement of the nut 22.
Optionally, the first anti-twisting portions 222 are provided in plurality, the first anti-twisting portions 222 are anti-twisting grooves formed in the outer peripheral wall of the nut 22, the second anti-twisting portions are anti-twisting protrusions formed on the fixing member, the first anti-twisting portions 222 correspond to the second anti-twisting portions one to one, and the first anti-twisting portions 222 are uniformly distributed along the outer peripheral wall of the nut 22 in the circumferential direction. Illustratively, the first torsion prevention part 222 is provided with three. In other embodiments, the first anti-twisting portion 222 is an anti-twisting groove formed on the fixing member, and the second anti-twisting portion may be an anti-twisting protrusion formed on the outer circumferential wall of the nut 22.
Example two
The difference between this embodiment and the first embodiment is that, as shown in fig. 6 and 7, there is a space between the projection of the expansion cavity 122 and the redundant groove on the cross section of the piston 12, i.e., the expansion cavity 122 is not communicated with the redundant groove. The cross-section of the expansion chamber 122 is not limited to the arcuate shape shown in fig. 7, but may be circular, square or any other shape that can be machined, and is not illustrated here.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (20)
1. A pressure distribution device comprising a cylinder (11) and a piston (12), the piston (12) being movably arranged within the cylinder (11);
characterized in that said pressure distribution device (1) further comprises a redundant structure comprising:
a first redundant portion (111), the first redundant portion (111) being provided to the cylinder (11);
a second redundant portion (121), wherein the second redundant portion (121) is arranged on the piston (12), and the first redundant portion (111) and the second redundant portion (121) are matched to form at least two redundant pressure chambers (112) which are not communicated with each other and have variable volumes.
2. A pressure distribution device according to claim 1, wherein the cylinder block (11) has a working chamber, the first redundant portion (111) is a redundant protrusion protruding from an inner wall of the working chamber, and the redundant protrusion divides the working chamber into at least two redundant pressure chambers (112) that are not communicated with each other;
the second redundant part (121) is a redundant groove arranged on the piston (12), one end of the piston (12) is provided with sub-pistons (124) which are in one-to-one correspondence with the redundant pressure chambers (112), and the sub-pistons (124) are arranged in the corresponding redundant pressure chambers (112) in a sliding mode.
3. A pressure distribution device according to claim 2, wherein the working chamber comprises two of the redundant pressure chambers (112), the two redundant pressure chambers (112) being arranged symmetrically along the central axis of the cylinder block (11);
the sub-pistons (124) comprise two sub-pistons (124), and the two sub-pistons (124) are respectively arranged symmetrically along the central axis of the piston (12).
4. A pressure distribution device according to claim 2, wherein at least one of the sub-pistons (124) is provided with a relief volume (122), and the relief volume (122) communicates with the redundant pressure chamber (112) corresponding to the sub-piston (124) to which it is attached.
5. The pressure distribution device of claim 4, wherein the expansion chambers (122) are in one-to-one correspondence and communication with the redundant pressure chambers (112).
6. A pressure distribution device according to claim 4, wherein the expansion chamber (122) is a groove dug in an axial end face of the sub-piston (124), an opening of the groove being arranged towards an opening of the redundant pressure chamber (112).
7. A pressure distribution device according to any one of claims 1 to 6, characterized in that a seal is provided between the outer circumferential surface of the piston (12) and the inner circumferential surface of the cylinder (11).
8. A pressure distribution device according to any one of claims 1 to 6, characterized in that a connection unit is connected to the end of the piston (12) remote from the redundant pressure chamber (112);
the connecting unit is used for being in threaded connection with the rotating piece, one of the connecting unit and the rotating piece is a nut, and the other one is a lead screw.
9. Pressure distribution device according to claim 8, wherein the connection unit is integral with the piston (12), or interference fit, or welded.
10. Pressure distribution device according to claim 8, wherein the connection unit is a nut (22) and the rotation element is a lead screw (21);
and an avoiding space (123) communicated with the internal thread hole on the nut (22) is arranged on the piston (12) and is used for accommodating the screw rod (21).
11. Pressure distribution device according to claim 9, characterized in that the pressure distribution device (1) further comprises an anti-rotation structure for limiting the rotation of the connection unit with respect to the rotation element.
12. The pressure distribution apparatus of claim 11, wherein the anti-rotation structure comprises:
a first rotation prevention unit provided on the cylinder body (11);
the second rotation preventing part is arranged on the piston (12), and the first rotation preventing part and the second rotation preventing part are matched to limit the piston (12) to rotate relative to the cylinder body (11).
13. Pressure distribution device according to claim 12, characterized in that said first rotation prevention means are said first redundancy (111) and said second rotation prevention means are said second redundancy (121).
14. Pressure distribution device according to claim 13, characterized in that the cross section of the first redundancy (111) is non-circular and non-circular.
15. A pressure distribution apparatus according to claim 13, wherein the connection unit is provided with a first anti-twist portion (222) for cooperating with a fixing member fixed relative to the cylinder (11) to restrict rotation of the connection unit relative to the fixing member.
16. A pressure control unit, characterized in that it comprises a pressure distribution device (1) according to any one of claims 1 to 15.
17. The pressure control unit of claim 16, further comprising:
a drive member (3);
the rotating part is in transmission connection with the driving part (3), and a connecting unit of the pressure distribution device (1) is in threaded connection with the rotating part.
18. A pressure control unit according to claim 17, characterized in that the connection unit is provided with a first anti-twist portion (222), and that a fixing member fixed relative to the cylinder (11) is provided with a second anti-twist portion;
the first and second anti-twist portions (222) cooperate to limit rotation of the connection unit relative to the fixture.
19. The pressure control unit of claim 18, wherein the connection unit is a nut (22), the first anti-twist portion (222) is an anti-twist groove provided in an outer peripheral wall of the connection unit, and the second anti-twist portion is an anti-twist protrusion provided on the fixing member.
20. A braking system comprising a pressure control unit as claimed in any one of claims 16 to 19.
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| CN202111350206.3A CN113954801B (en) | 2021-11-15 | 2021-11-15 | Pressure distribution device, pressure control unit and braking system |
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| CN202111350206.3A CN113954801B (en) | 2021-11-15 | 2021-11-15 | Pressure distribution device, pressure control unit and braking system |
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| CN113954801B CN113954801B (en) | 2023-04-11 |
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| JPH10235476A (en) * | 1997-02-25 | 1998-09-08 | Inoue Seisakusho:Kk | Fluid cylinder for welder |
| JPH11125214A (en) * | 1997-10-23 | 1999-05-11 | Copros | Twin hydraulic/pneumatic cylinder |
| CN206206307U (en) * | 2016-07-19 | 2017-05-31 | 福建省龙岩盛通液压有限公司 | A kind of double-driving hydraulic jack |
| CN113002509A (en) * | 2021-04-07 | 2021-06-22 | 南京经纬达汽车科技有限公司 | Multifunctional dual-motor redundant braking system and control method |
| CN113374756A (en) * | 2021-05-31 | 2021-09-10 | 泸州市巨力液压有限公司 | Integrated double oil cylinder |
| CN113511177A (en) * | 2021-08-09 | 2021-10-19 | 吉林东光奥威汽车制动系统有限公司 | Transmission device of electronic hydraulic brake boosting booster mechanism |
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2021
- 2021-11-15 CN CN202111350206.3A patent/CN113954801B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10235476A (en) * | 1997-02-25 | 1998-09-08 | Inoue Seisakusho:Kk | Fluid cylinder for welder |
| JPH11125214A (en) * | 1997-10-23 | 1999-05-11 | Copros | Twin hydraulic/pneumatic cylinder |
| CN206206307U (en) * | 2016-07-19 | 2017-05-31 | 福建省龙岩盛通液压有限公司 | A kind of double-driving hydraulic jack |
| CN113002509A (en) * | 2021-04-07 | 2021-06-22 | 南京经纬达汽车科技有限公司 | Multifunctional dual-motor redundant braking system and control method |
| CN113374756A (en) * | 2021-05-31 | 2021-09-10 | 泸州市巨力液压有限公司 | Integrated double oil cylinder |
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| CN113954801B (en) | 2023-04-11 |
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